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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf28f1f06795622f2d238a6da7e0e9c7bf5a259935fe9f70b17ef55383edb9b' 
  AND token = 'LimPsI2pC7FpPADh5R3B0vEbz4gJPv0XPrPwTMrnuDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}